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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6709a1c99d07c54ffc4fc7ec92a0ac805e24fadf499fa0de14ee6e6915e8977d' 
  AND token = 'UDS7DEiaDp2foTFY5Ol5uRdrJ9dJj4VoZR3QwGWlvtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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