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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a492ecbfc055b93eee3965494a3dced6d067b67a027c869526820a3c02a83cd7' 
  AND token = '0u4DpUijyGOFVZUHd8UPX24XkmLzvvRbupH0zm16iJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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