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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b39691dcadf7e4c3a5ee1ebacfd298e6773cc6b6a2d983063a45b4b41ffb5de' 
  AND token = 'VsoCtrwJs5IDn6NWGgAWugOYZKlcSElaq5TbD6o9fFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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