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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a1d861c37baa548d6cbedd63d5c688ba14e4a87800f513c604dd9e74efa021b' 
  AND token = 'Pgce4o2STfIgRdff9lphCRa+1j2Dgd38pEXqTgimpXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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