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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc7c38f9594a5e9c950a40ad293bd580539c4b07339ba460a55ad768964ad242' 
  AND token = '6d9mIcwkUa7gS06OoonMFjCl0VlP6kFUJdh1DPlBkzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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