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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73090a26d469aece474d0242af82688087d58912262289e8d625b2c709ed1654' 
  AND token = 'Tb1Se8FzjAetR1L9XKDkyCjpMWVLa+bEgkXtPuZ6kcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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