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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcebcbffbfb0f2ae7b067cefc02ab619d12844721454f718372417e52b238623' 
  AND token = 'C1I09H/0Y97gafq1ApneTVQ6lZLaPheA8A7XFrkS32M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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