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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4690f3bfa67ae2f30e22a7172775e043eef4f45d95db372781f6938a3ddab53d' 
  AND token = 'bNe7gj0angmAm7RmM7xolqNtQmhsrLe3M6lf3osFlH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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