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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9b2b81a74b279ba1f795cf3572bedbddd72100176668737b7f7704e04074933' 
  AND token = 'k3PFkjxSwfz24adAiogrEizYa0j07+sGgZHS2LqKA1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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