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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32c76c25eca729ce8fdd76d1080d58a831647679f10720fb2fa323d21dae10d2' 
  AND token = '/xzmyKxe/x0fiI43AreheK5CEqz8+IV1z5KEOWfoR+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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