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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38805d3632f76684012f8b9503e69cd035347d519a84dd7deae4560336b2baf4' 
  AND token = 'K1eQa8RM6wV7brTaxlb2PIo+xAZMzVWzJz6O42TPVcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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