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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8673a8a4d5b77421518555eeb4cb52c5cc10d6dcf9a0843fdc7dc6d3c61fde32' 
  AND token = 'v19MjDATmLIzbmiZGOxl4puKAi9df8NzH6ht8gKLn8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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