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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '436afbb46b5e5afd8d90bd8919d9cebf3ab5ffae2a93364b13d169a91d3b9f90' 
  AND token = 'JrdO9w3YlEUtnP0+AK0O9Co9n9y05JxNtWVxXYrqsC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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