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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05fb6513d812452ea9c08b9957f87aaeef0212f1b58fe85db1abf0d2549e1ba7' 
  AND token = '3eYfd1xwsC6PzmJYLTNgM2XyIHyPM+k/kFzT8osxvI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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