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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8932b5a8d07748906c85f19adf7d977f867333e966b18a2d7e918a9e1559c981' 
  AND token = 'BFlJ24P1IbcBhxHbeqUq1bYYqc0xQJ0q1yIG9DyGCPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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