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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1326822d1435c4f79753558d8f7ac74bb54c808c7228abcc393b5e9aef7cc27f' 
  AND token = '/GluJG2t2CkKMDF0Zw7190PEGkUH+/TZb5RgA3hmssU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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