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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c2b491fb5d768fc827eedab1d97cda8b3dc06a19ff2871c873647a89bc859fd' 
  AND token = 'tWduf6z4HS7x/9qG/DGwNzn3/cJGP+DR/ktd8TY6knc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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