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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd52ef1507561599715f4e5e027f0037f769b68d14f8d4551e327be8d5fb72ca9' 
  AND token = '3u1soI9uSrOZy78WZC4FfUt/f2Fx8I9xT15j6CGuMxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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