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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9054cd9b55104bee97a75cbdfe58cfc2c42a53e2107da1492dc5f203b70005f' 
  AND token = '10RfI2S3iSWkOJaeADd6jEm2QC/5Gh7A9yrDm+Fserk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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