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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc540c8db288c682d97cd2cc7452010f2865af57e96c3d93c0599e1610f737a3' 
  AND token = 'NQm8UNXeAJFJ4yvvqIsKFa7HBxZBi2fmg0Ytb08q5h8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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