SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64f110d94829dc579b7ceaaf4609615b0877db069e5d4cab6ee98c1ce6b8ae16' 
  AND token = 'jrflwYTGIAjcYdKHm1/VDQu1J32+okpWQUgYYWkThv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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