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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c04d0bbe7c769d8bd5cbb7a55a1505c8fb6456bf2bdaef4e1d900c1d2751f156' 
  AND token = 'G6bW2xTooHOPrxKqfpSqGIYFVJ3gi+WYJssYriq6m7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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