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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbd14bd2cd1d388c8bbaa03c616c63d260d6fbb892ce91f1081c68b63e4298c3' 
  AND token = 'HjQ2j6eDo4pUgR+8uTceJlO9NMqGRrPJ0B077CMSAmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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