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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b285a445eab152fa5166219f788c79ca67c26abd5923a8900a0757a6f415fd7' 
  AND token = '3+2qmJBNiw+nThI29JFGlDOSP0fbn2EdUEeMdSnD2DA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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