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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c1d190e8c88ca74821a55fe21743b26f36bd6c1f0b041e40c775a2ff1295071' 
  AND token = 'vosog1dXqo36t6lyVwdwes9RE2cPNP2B7CUjFgBC+fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}