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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9284bed71a1b39d0020f816d7812cdce099140aac2901ccf1b3c047cead2d6a' 
  AND token = 'njAp/Ma24CqgVasKcbY76uHOeH5e5Zjbej6YfYjILTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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