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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbd5d08a24446638389572a2d9c6ab35b558b3072e0171b036452e5838574e3e' 
  AND token = 'KMLC7PpdcQkdEZCqKfUZ7DBQVeQtwwwVE/mi9nwmkGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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