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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '319aba677962af9057e8ee5469c6a6038a674a926a4b60164d9505266e22cd6f' 
  AND token = 'cUKCH2jJPZE7P+fJH0Rt4IyGODmJkoA1a0zMmaiaqRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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