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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f846cd26e54a1c0ce5d212679eb4283fae3473a8d6e26994fcde4e1b6e8e8ac8' 
  AND token = 's1WFmm97gO9L72FkDyYcfUbv/I96f4Hb1XGuzYyKdjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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