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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd41e82f046a77063e324210b0aef77a31bbf5d87cd7d83da5513a1c0c93889fc' 
  AND token = 'gJSac4wH1Pbx6G8HlRMcksVbXJ5spC3oxlCr6Y/hbqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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