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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5e18edf59a61b77a7dd93fdde26e1d8414fcac5b1877895e1b3b931e07dbe62' 
  AND token = 'LTn2SyIiODIk+RbrZRG5jwaojUDbdFjmEjQTaLcxJio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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