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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65616aacaa4205d21c12aac898908e7831c2e5ca88c90d0f7033a5d0de6ef2d9' 
  AND token = 'Wqu5KWk6SkP/UD1fWAQ55FkGQmGZXB5Ve0mU9VzJlcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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