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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9170437c94481717258b1719c500f769d85af9abc4b5e8b9b900bb5556244eb2' 
  AND token = 'pVPkUFt4EGQ76f9AzHRM2579819zHiqVLM2/p0yuGLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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