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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a8e2fa1c9958ad7592fea5c2ad9afd73bfabd32faefcfab91a59692269ecae7' 
  AND token = 'x1vJ7cUpcvrakOEWEnji9Jw8qKkckFZIZ5PsLIeSF2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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