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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b22e5899afa3db737f94dcd581a43da1f917c8d814ace333155c4c7ee7b1af91' 
  AND token = 'WmF4wPrOCeVwnlgdDJnVV+lAoYTcdjCasDivNlL2QIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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