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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5540616431099488aaa61b966e8378837d3afb64b9feb49a8b66b844d4826de0' 
  AND token = '5SFYmLIjBeZID0MuKzjgT20MORwnpBw1V6b32zbNcBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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