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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1e2ffaf4bb507f564879bd3ad84af6cb85b2e4522e37d64b2832504e2f4fa16' 
  AND token = 'O7CApOwYNj15fUdemqtO3HR5JaRmMgQf5jMK93rjJNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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