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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c10b40df86f374da6764bdba00f250c21525c4f5141ec5b18a583e76da737f17' 
  AND token = 'v7IL2OdyUrZxmeuglVgL5jsc3ufKhxuVa9eLgmLvKCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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