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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd59b4de3e703648c0bd844b571b516efec8edb238dad9528df3b84d7f6dd72e1' 
  AND token = 'lwCpz8VHYmtWNRs68klfZ6KyNjl0PukB4NAabSh8H6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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