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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1f818534d2f5ccdc35a729982f6c38ba759b7a8de2e267315ba2dffb83643cd' 
  AND token = 'X/5n9WOkNHjyO/TDa1l/7SVJBxM9TuaDM2oWtBPr09E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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