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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '248b77a99bf7c368c7962d7faa8f9310179ece265e183500b8358e265a55dedc' 
  AND token = '08L+LKHTmu0zMMldX9XCF6NOnwzDAbd6wLvM+iGus5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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