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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '535c9845f84743fab8acb83d488c40d40ed7903ddc7f09ffdee27ef412af155a' 
  AND token = 'QjC53OdyrtA9Arh/veVrjeoOgAawt65tQfBLhdEpliA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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