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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f51a0149e8bb3a96ff8f94e407621d741719c76bc4af3a5a7719dc799ecaa14' 
  AND token = '443POqwn34ruyM0EQZ/97/4ot2i7ccTGVHaVeuz5AuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00097

JSON explain

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