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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ad81b5408ccc1cbd2721ff49513d6236d2beda63860eb1a6ec9b116012c06fd' 
  AND token = '5BhNTym8+a0QA3+LAHY0Qxaz3Q8IKuHgOVbbsi+KMl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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