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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40867305d4753beda7b9a68bb89919bd26ab344c15005a28030e14bb17231c1f' 
  AND token = 'ffksijRjGGULDbhLEsKOEfANStx16+LH5RN0Imy2bQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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