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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd17fe05f2ec13ecbabc3d08be70350780127c92947ae7594ecf1bafc77757862' 
  AND token = 'AUjuWvoWurmqr47kA3cgHl18MI3H7QpMQhTnqwh7lRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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