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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92c5e42cab497503e42dd7237fb1fc83121c6684169414162cdbc03684da595c' 
  AND token = 'WSfUcrTgNcaGkEt6RL22a1zOgDo5O/kuMYHXLOS9FD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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