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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6baa0e3859aa54672a222a426f582acfdb4eb0788b4b5cf24b26b7ebab781ea0' 
  AND token = 'lCa68+jq2tU1bof4RWgLSS6Cb4KnvpFKJ85gtZCWg0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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