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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a3bbd6ac251d6299d5d8c577f357538b7d6c5633816e9da09870e8ad33b6e11' 
  AND token = 'Ky00kGdlgH9O+tbfleTxuJuXaXDsswO7drC0dG7En9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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