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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a8868ed989421a3b36d5edf6bb88efca4be65b6ab5cc28fd6156037b411ec5a' 
  AND token = 'yDdJ7aW92KP5vR3hZkpN6vbRH5QvDswND/e4ulsK6sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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