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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0fa8c6f1176ec1b997f62ada0c099ed1dadc04851c8ee205ca7d7392016f1ec' 
  AND token = 'ZlKS8pwkzlTA8XCVWGQM5fYpTCHP/2NATzg3R47G9b8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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