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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a34173c2dbafed5b44cb559be07616fc674b8c5b3e343d8c8a405f3f0ff67045' 
  AND token = 'pG/4fN1e5X+vnuiNhD7soeLEK093vnACwQsuB7MS4yI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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