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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b2945905088ba5e2eb33c4b8a50e1481a72eb9477ba9b8e5393ffca4353a523' 
  AND token = 'Nt1rWFbdqb3I2pti/WL9779QJpeQghtT9V4qPVrihUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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