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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94d0eeb324018cf83f0ed3d51bbc2d79121926739d64d8ea9af7ae431b191d31' 
  AND token = 'yNzBKnKIxvPgiJfPg12wi85+YO/cUa5PPQYO9CQH4fM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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