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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df2565a6885a65f3550b2fd90640ecc1ab62161cd918ab1064edae46c5941e56' 
  AND token = 'e0TNNjkLmc2h3VkedRqGJTirbLX58bP+2F8aM/SS7EE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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