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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b46efe549cdd3b34d01f01506cda8d852d63a761473ae1f711f61268f511f017' 
  AND token = 'fpPRH6NAaYz/hIC1+DRWU7j0j8272Bk1qM7SufuMKFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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