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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac44a702eb9375209b8efb89f10e46c7c02422eb2933be79d79b35512e0ecc5b' 
  AND token = '2/IpKuW+KtjMpWj+autKKOxOCk6abyK9wII+ThKkB2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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