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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c25f9d68a3e056c7fd6b4f9f4b15cc4eb1bc8f1dcc8bd8e60a51594b49f5508f' 
  AND token = 'x4zMiT6LyrYMj5KYZmvImIiEgum7h4bplpCjXx/kp2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00112

JSON explain

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