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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '931676177f05553056492be7fbb325fcfbfa755c0d94f7dc800441e62115d517' 
  AND token = '8DBcnrbcMMzP0qnDc+rIOROrjn3x6JSKZ6q55nOW5W0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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