SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf7cc4b99ea00f49b0c6ecfcf2d1a44309b97f9b21718dff1666663e5c299f54' 
  AND token = 'NBhAY49xN4D7KRMK68I+mp/VMF4TAzzjJDuSXMWJv08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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