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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ee0d8a26b313a068bb83557e9b2839cbe34ce4db928fa5b5b04e87dcdfa87fb' 
  AND token = 'GBXXo2cVYEQBelygisipb/aQHl4d2l47Ov1h0sW3a6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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