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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16d082ce198eaa7fa36b3befaccbfb72e21387f88c295837a1995c4fa20257b3' 
  AND token = 'PKC3zjLxTkwjtQzy5SW8CfPgoh4EzMvtK8VZNhaLlNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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