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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b92e4fa69b4d7b9e68a4c81f8304e324cbe9ccd52abd6abb86f814a50289e6f' 
  AND token = 'DlIlr+6ZzbxBfkoRaRoO1qta9CBy1wNOf04XqI9qW8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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