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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26e9ce5ab8313438b6e1ac6db65ede84503f02e2e22f48012548dbaf22770b1b' 
  AND token = 'H+Hjk1zi8GOJ5KawMD7cqAs6wkta66lFWPKoUP96sHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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