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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bad0c21449dae9bb00de08df5fc84c89451b8674bd1292b1752964c88fe6bcd7' 
  AND token = 'SeN47hfkk5fufgY+B1YOpXVUCKs91ACf81XILHdRSRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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