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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6021fb6422cf314ee62081fa552aad5a81806f5f2c9d7db4fd4dfbb7d9b7430f' 
  AND token = 'bAkrw+Yi5EThafpBmxijuNgy2/koEZ+WAdiimzIh+Tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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