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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c34b88885ccad723d6fd693bb5c0ca3d84adac3aa31b286a9054b483260c592' 
  AND token = 'Tx1RRYpM7OCNQEEeDWYlbNJ7l+WCDyhT3NxvUr3dIhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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