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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b8078b70b1747d85095337248d37f762c0c718d4a723c59147b54eb246c81f5' 
  AND token = 'ZBBqoub2jV7tj2og3j4OLn7MSv7q0y5ZuVOcKL7j7Xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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